WTF is going on in this thread?
You obviously can target gain mass.
The OP is a HIGH SCHOOL sprinter. I wouldn't recommend taking Jacked, or any other serious stim.
Yes, creatine is the ONE thing that WILL improve sprint times, period. No joke, no BS, it is the one natural supplement which will do just that. It will not increase cramping, unless you are a moron (yes, your IQ combined with creatine consumption will cause cramping if IQ is under 100

).
Rhodiola and cordyceps also increase ATP, and they could be very beneficial, especially cordyceps.
About stims: the study quoted above is correct. But to get a decrease in sprint times, or any sort of athletic boost from caffeine, you can't use chronically. You must abstain from all caffeine use for several months, then hit about 300-600mg (or less, if sublingually) pre-event. (but DO NOT do this without trying it outside the event to gauge your tolerance and reaction).